Hello,
Someone can tell me "for sure" if the TX "WALKERA DEVO 12" can be bind with a RX spektrum DSM2 or DSMX and Align 3GX?
Thank you for answers.

If you are willing to install non-stock firmware, the answer is yes. The main page can be found here: Deviation - Home

On that page, it says that DSM2 & DSMX are supported without hardware modification to the transmitter. I have no experience with this transmitter, so I can't say what is actually involved in making it work.